| All Patents in class 408/181 |
Patents 16 -
30
of 38
      |
| Number | Date | Patentee | Title | Type |
| 981,062 | Jan. 10, 1911 | H. Casler | Boring Head | boring heads |
| 1,004,572 | Oct. 03, 1911 | A.L. Jennings | Auger-bit | adjustable drill bits |
| 1,237,185 | Aug. 14, 1917 | A.L. Ewen | Tool Holder | drilling and boring tool holders |
| 1,386,082 | Aug. 02, 1921 | W.M. Whitney | Drum-saw machine | other wood sawing machines |
| 1,740,055 | Dec. 17, 1929 | J.H. Abramson | Expansive bit | adjustable drill bits |
| 1,769,230 | Jul. 01, 1930 | H.H. Manning | Rotary cutter | boring bars |
| 2,305,737 | Dec. 22, 1942 | J.H. Richards | Boring Attachment for Milling Machines | milling machine tools |
| 2,382,571 | Aug. 14, 1945 | O. Kylin | Adjustable Supporting Tool | |
| 2,398,491 | Apr. 16, 1946 | N. Bell | Boring Head | boring heads |
| 2,412,937 | Dec. 24, 1946 | E.A. Allen | Boring head | boring heads |
| 2,489,719 | Nov. 29, 1949 | H.E. Myers | Boring Head With Facing Feed | boring heads |
| 2,537,517 | Jan. 09, 1951 | C.B. De Vlieg | Metal cutting tool | boring bars |
| 2,564,460 | Aug. 14, 1951 | J.R. Blanco | Boring Head | boring heads |
| 2,654,610 | Oct. 06, 1953 | H.R. De Vlieg | Offset boring head | boring heads |
| 2,661,218 | Dec. 01, 1953 | H.R. Snow, R.M. Snow | Offset Boring Head | boring heads |
